1940s; earliest use found in Journal of Paleontology. From Rotali- + -id, after scientific Latin Rotaliidae, family name. Compare scientific Latin Rotaliida, order name.
英语词典包含243303条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。